This double-sided sliding puzzle cannot be solved completely - if one side is in the right order, the other side will be out of order.
A never-ending task ...
Print with 0.4 mm line width and 0.2 mm layer height.
If the fit is too tight, adjust "XY Size Compensation" in PrusaSlicer (or "Horizontal Expansion" in Cura) by a few hundredths of a millimeter.
The sliding puzzle may be stiff after printing, a few movements of the parts will make it smoother.
If you want a multi colored sliding puzzle, change filament at layer 4 and layer 31.
The author marked this model as their own original creation.